What version are you using?
On Aug 16, 2011, at 3:19 AM, Simone Pellegrini wrote: > Dear all, > I am developing a system to manage MPI tasks on top of MPI. The architecture > is rather simple, I have a set of scheduler processes which takes care to > manage the resources of a node. The idea is to have 1 (or more) of those > scheduler allocated on each node of a cluster and then create new MPI > processes (on demand) as computation is needed. Allocation of processes is > done using MPI_Spawn. > > The system now works fine on a single node by allocating the main scheduler > using the following mpi command: > mpirun --np 1 ./scheduler ... > > Now when I scale to multiple nodes problems with default MPI behaviour > starts. For example lets assume I have 2 nodes with 8 cpu cores each. I > therefore set up a machine file in the following way: > > s01 slots=1 > s02 slots=1 > > and start the node schedulers in the following way: > mpirun --np 2 --machinefile machinefile ./scheduler ... > > This allocates the processes correctly, now the problem starts when I invoke > MPI_Spawn. basically MPI spawn also uses the informations from the > machinefile and if 4 MPI processes are spawned 2 are allocated in s01 and 2 > on s02. What I want is to allocate the processes always in the same node. > > I tried to do this by specifying an MPI_Info object which is then passed to > the MPI_Spawn routine. I tried to set the "host" property to the hostname of > the machine where the scheduler is running but this didn't help. > > Unfortunately there is very little documentation on this. > > Thanks for the help, > Simone > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users
